Primarily Petroliana Shop Talk Forums Thread Like Summary - Pump plate Ultra-Power history

I’m looking for some info on the different colors of pump plates.I Believe it is for different grades of gasoline. Does anybody know what grades correlate with the different colors? In what years they were used?. Thanks for any information. The picture of the gas pump is not mine.

These Ultra Power plates were mounted under the Utoco pump plates and were used in the later days of the Utoco period . From late 1940s to 1960 . The Blue and White are Ethyl grade gasoline and the red and white are regular .